Circumferentor

ca. 1770 – 1800

Engineers used this instrument to lay out entrenchments, fortifications, and large camps. This surveying instrument sat on a wooden tripod or staff. It contains a circular brass bar with sights and a compass in the middle.

Wood, brass, glass. L 30, H 6, Dia 22.9 cm
Valley Forge National Historical Park, VAFO 30274